From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753948Ab1GHTgj (ORCPT ); Fri, 8 Jul 2011 15:36:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:28210 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752168Ab1GHTgi (ORCPT ); Fri, 8 Jul 2011 15:36:38 -0400 Message-ID: <4E175C45.1060700@redhat.com> Date: Fri, 08 Jul 2011 15:36:37 -0400 From: Prarit Bhargava User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100505 Fedora/3.0.4-2.el6 Thunderbird/3.0.4 MIME-Version: 1.0 To: Linux Kernel Subject: 3.0.0-rc6 ~9X system time degradation on kernbench Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Just some numbers out of kernbench. System Time & Context Switches climb dramatically between 2.6.38 and 3.0.0-rc6. Currently bisecting to find out why. .config is based on Fedora's x86_64 .config. Thu Jul 7 18:23:48 EDT 2011 2.6.38.8-32.fc15.x86_64 Average Half load -j 64 Run (std deviation): Elapsed Time 155.376 (3.77835) User Time 4536.18 (11.5886) System Time 1810.42 (27.0879) Percent CPU 4086 (100.252) Context Switches 794941 (3757.3) Sleeps 754029 (10516) Thu Jul 7 19:50:38 EDT 2011 3.0.0-rc6 Average Half load -j 64 Run (std deviation): Elapsed Time 466.362 (2.78605) User Time 8616.43 (22.5528) System Time 14583.6 (63.2273) Percent CPU 4974.2 (19.6265) Context Switches 2.69157e+06 (7679.26) Sleeps 827950 (3050.16) Thu Jul 7 21:30:22 EDT 2011 2.6.39 Average Half load -j 64 Run (std deviation): Elapsed Time 250.044 (2.55373) User Time 5361.27 (14.6996) System Time 5173.44 (14.9366) Percent CPU 4212.8 (40.4314) Context Switches 1.28385e+06 (1610.42) Sleeps 741129 (3339.19) Fri Jul 8 12:21:29 EDT 2011 3.0.0-rc1 Average Optimal load -j 64 Run (std deviation): Elapsed Time 435.338 (5.45314) User Time 6125.78 (15.2816) System Time 8346.45 (62.5065) Percent CPU 3324.2 (29.0637) Context Switches 6.42863e+06 (23420) Sleeps 996764 (3744.98) P.